TTS not completing

Since yesterday i am encountering problems in my Unreal Engine 5.7.4 project. The transcript appears in the Chat UI on screen and before the characters TTS would kick in and the transcript would be read out loud with face sync.
Now the character stops speaking slightly before reaching the end of every sentence, no matter which voice provider i choose. This is very unfortunate. I read the related posts and found nothing helpful. I did not customize anything about the chat bot behavior in Unreal. It is basically the vanilla versionfrom the latest version of the SDK. Any help at all would be greatly appreciated. This bug actually appeared yesterday evening when doing the last few preparations for a presentation of this sample project.

Could you please share the logs?